So excited getting this running on my server 
Having small issue though, I have followed this guide: https://www.digitalocean.com/community/tutorials/how-to-secure-apache-with-let-s-encrypt-on-ubuntu-14-04 but does not go through successfully. I got this message:
Failed authorization procedure. mydomain.com (tls-sni-01): urn:acme:error:authorized :: the client lacks sufficient authorization :: incorrect validation certificate for tls-sni-01 challenge.
Anybody got idea why it is doing this?
Are you using a CDN like CloudFlare or some kind of load balancer or reverse proxy in front of your apache instance? In that case, you’d need to use a different challenge type, as TLS-SNI-01 does not work in such scenarios. One possibility would be the webroot plugin.
If it’s not related to that, please re-run the client using -vvvv and provide the full output and log files from /var/log/letsencrypt.
No not using Cloudflare. I managed get this installed on Plesk extensions and on each site individually, busy testing now. But all looks good, thank you for the quick reply/
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